#include "MEMS.h"
#include "IIC.h"


/**
  * @brief  MEMS数字甲醛传感器IIC端口初始化
  * @param  None
  * @retval	None
  */
void MEMS_CH2O_init(void)
{
	IIC_init(); // iic延时计数400
}
/**
  * @brief  读取MEMS数字甲醛传感器检测浓度
  * @param  None
  * @retval 返回读取到的数据 2字节 0-100ppm 正常<=2
  */
uint16_t MEMS_CH2O_read(void)
{
	uint8_t recHigh = 0,recLow = 0;
	IIC_start();
	IIC_send_byte(MEMS_CH2O_wrAddr); // slave address + write cmd
	if(IIC_wait_ack()) return 0xFFFF;
	IIC_send_byte(0xA1); // read cmd
	if(IIC_wait_ack()) return 0xFFFE;
	IIC_start();
	IIC_send_byte(MEMS_CH2O_rdAddr); // slave address + read cmd
	if(IIC_wait_ack()) return 0xFFFD;
	recHigh = IIC_read_byte(1);
	recLow = IIC_read_byte(0);
	IIC_stop();
	return (uint16_t)recHigh << 8 | recLow;
}